Gordon damon



G. DALToN. FouNTAN PEN.

APPLICATION FILED AUG.28. 1918.

Patented May 20, 1919.

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GORDON DALTON, 0F CANTERBURY, ENGLAND.

FOUNTAIN-PEN.

Specification of Letters Patent.

Patented May 20, 1919.

Application led August 28, 1918. Serial No. 251,796.

To all whom t may concern:

Be it known that I, GORDON DALToN, a subject of the King of Great Britain, residing at Canterbury, in the county of Kent, England, have invented new and useful Improvernents in Fountain-Pens, of which the following is a. specification.

This invention relates to that class of self-iilling fountain pen in which the wellknown device of a central rod with an outside screw head and an internal plug proj ecting into the pen carrier, acting as a valve for regulating and shutting the supply of ink to the nib, is utilized for carrying a piston, so forming a pump for filling purposes; and has for its object a more reliable way of filling than heretofore.

A pen made according'to this invention is constructed as the usual ink regulating fountain pen, in which the piston rod is utilized to carry the piston and a plug forming a valve to shut off the ink to the nib, the piston being slidably mounted on the central rod, but capable of being readily connected to, or disconnected therefrom. According to my invention, the connection is made by tapering the rear end of the plug of the shut-oif, so that it wedges in a corresponding recess in the piston, which is disconnected automatically from the plug just prior to the completion of the return stroke; and a vacuum is formed behind the piston during this stroke, so that it is returned to the rear end of the reservoir by the pressure of the incoming ink.

The figure is a part longitudinal section of a pen made according to this invention.

a, is the pen carrier; b, is the barrel; c, the reservoir; d, e, f, are the plug shut-off valve,

piston rod, and screw head respectively; d, the tapered portion of the plug shut-oil' valve; g, the piston in its normal position; and g', is a tapered recess7 corresponding to the tapered portion of the plug shut-off valve.

In filling, the nozzle of the pen carrier is immersed in ink, and the screw head f, is pulled back until the tapered portion d of the plug shut-off valve al, wedges in the corresponding recess g of the piston g. The return stroke carries the piston to the position shown in broken line, butting against the pen carrier a, so forming a vacuum in the rear portion of the reservoir c. The same continued motion pushes the plug shut- 0H valve out of the pis-ton, so disconnecting it, and allowing ink to enter through the duct of the pen carrier by the pressure of the atmosphere, carrying the piston to the rear end of the reservoir. The position taken up by the piston is quite out of the way, thus not interfering with the flow of ink to the nib; and leaves the shut-off free to be screwed up, or to regulate the flow of ink to the nib.

Having now particularly described and ascertained the nature of my said invention, and in what manner the `same is to 'be performed, I declare that what I claim is In a fountain pen, a reservoir, a piston rod having a tapered portion adjacent its lower end, and a piston slidably mounted on the piston rod and provided in its lower face with a tapered recess adapted to receive the tapered portion of the piston rod to lock it to said rod by frictional engagement.

Dated the 3rd day of August, 1918.

GORDON DALTON.

Copies of this patent may be obtained for iive cents each, by addressing the Commissioner oi' Patents,

Washington, D. U. 

